EVDO掉话信令流程 - Allen

EVDO掉话 一：EVDO Connection正常呼叫流程如下

Air_interface

AT

Connection Request Traffic Channel Assignment Traffic Channel Complete Connection Close Connection Close

AN

当EVDO出现掉话后，AN将不会发送Connection Close 消息给AT.同时在Log中将出现1xEV Connection Release记录指示掉话的原因。比如：

Reason = 2 System lost (supervision failures, TCA message rejected)

如下为一个掉话的信令流程实例：

1.Connection Request消息

2.Traffic Channel Assignment消息

3.Traffic Channel Complete消息

4.Connection Release 记录

5.掉话后重新发起的Connection Request消息。

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